diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_lut.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_lut.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_lut.c b/drivers/media/platform/vsp1/vsp1_lut.c new file mode 100644 index 00000000000..fea36ebe256 --- /dev/null +++ b/drivers/media/platform/vsp1/vsp1_lut.c @@ -0,0 +1,251 @@ +/* + * vsp1_lut.c -- R-Car VSP1 Look-Up Table + * + * Copyright (C) 2013 Renesas Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/device.h> +#include <linux/gfp.h> +#include <linux/vsp1.h> + +#include <media/v4l2-subdev.h> + +#include "vsp1.h" +#include "vsp1_lut.h" + +#define LUT_MIN_SIZE 4U +#define LUT_MAX_SIZE 8190U + +/* ----------------------------------------------------------------------------- + * Device Access + */ + +static inline u32 vsp1_lut_read(struct vsp1_lut *lut, u32 reg) +{ + return vsp1_read(lut->entity.vsp1, reg); +} + +static inline void vsp1_lut_write(struct vsp1_lut *lut, u32 reg, u32 data) +{ + vsp1_write(lut->entity.vsp1, reg, data); +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Core Operations + */ + +static void lut_configure(struct vsp1_lut *lut, struct vsp1_lut_config *config) +{ + memcpy_toio(lut->entity.vsp1->mmio + VI6_LUT_TABLE, config->lut, + sizeof(config->lut)); +} + +static long lut_ioctl(struct v4l2_subdev *subdev, unsigned int cmd, void *arg) +{ + struct vsp1_lut *lut = to_lut(subdev); + + switch (cmd) { + case VIDIOC_VSP1_LUT_CONFIG: + lut_configure(lut, arg); + return 0; + + default: + return -ENOIOCTLCMD; + } +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Video Operations + */ + +static int lut_s_stream(struct v4l2_subdev *subdev, int enable) +{ + struct vsp1_lut *lut = to_lut(subdev); + + if (!enable) + return 0; + + vsp1_lut_write(lut, VI6_LUT_CTRL, VI6_LUT_CTRL_EN); + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Pad Operations + */ + +static int lut_enum_mbus_code(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_mbus_code_enum *code) +{ + static const unsigned int codes[] = { + V4L2_MBUS_FMT_ARGB8888_1X32, + V4L2_MBUS_FMT_AHSV8888_1X32, + V4L2_MBUS_FMT_AYUV8_1X32, + }; + struct v4l2_mbus_framefmt *format; + + if (code->pad == LUT_PAD_SINK) { + if (code->index >= ARRAY_SIZE(codes)) + return -EINVAL; + + code->code = codes[code->index]; + } else { + /* The LUT can't perform format conversion, the sink format is + * always identical to the source format. + */ + if (code->index) + return -EINVAL; + + format = v4l2_subdev_get_try_format(fh, LUT_PAD_SINK); + code->code = format->code; + } + + return 0; +} + +static int lut_enum_frame_size(struct v4l2_subdev *subdev, + struct v4l2_subdev_fh *fh, + struct v4l2_subdev_frame_size_enum *fse) +{ + struct v4l2_mbus_framefmt *format; + + format = v4l2_subdev_get_try_format(fh, fse->pad); + + if (fse->index || fse->code != format->code) + return -EINVAL; + + if (fse->pad == LUT_PAD_SINK) { + fse->min_width = LUT_MIN_SIZE; + fse->max_width = LUT_MAX_SIZE; + fse->min_height = LUT_MIN_SIZE; + fse->max_height = LUT_MAX_SIZE; + } else { + /* The size on the source pad are fixed and always identical to + * the size on the sink pad. + */ + fse->min_width = format->width; + fse->max_width = format->width; + fse->min_height = format->height; + fse->max_height = format->height; + } + + return 0; +} + +static int lut_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, + struct v4l2_subdev_format *fmt) +{ + struct vsp1_lut *lut = to_lut(subdev); + + fmt->format = *vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad, + fmt->which); + + return 0; +} + +static int lut_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, + struct v4l2_subdev_format *fmt) +{ + struct vsp1_lut *lut = to_lut(subdev); + struct v4l2_mbus_framefmt *format; + + /* Default to YUV if the requested format is not supported. */ + if (fmt->format.code != V4L2_MBUS_FMT_ARGB8888_1X32 && + fmt->format.code != V4L2_MBUS_FMT_AHSV8888_1X32 && + fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32) + fmt->format.code = V4L2_MBUS_FMT_AYUV8_1X32; + + format = vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad, + fmt->which); + + if (fmt->pad == LUT_PAD_SOURCE) { + /* The LUT output format can't be modified. */ + fmt->format = *format; + return 0; + } + + format->width = clamp_t(unsigned int, fmt->format.width, + LUT_MIN_SIZE, LUT_MAX_SIZE); + format->height = clamp_t(unsigned int, fmt->format.height, + LUT_MIN_SIZE, LUT_MAX_SIZE); + format->field = V4L2_FIELD_NONE; + format->colorspace = V4L2_COLORSPACE_SRGB; + + fmt->format = *format; + + /* Propagate the format to the source pad. */ + format = vsp1_entity_get_pad_format(&lut->entity, fh, LUT_PAD_SOURCE, + fmt->which); + *format = fmt->format; + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdevice Operations + */ + +static struct v4l2_subdev_core_ops lut_core_ops = { + .ioctl = lut_ioctl, +}; + +static struct v4l2_subdev_video_ops lut_video_ops = { + .s_stream = lut_s_stream, +}; + +static struct v4l2_subdev_pad_ops lut_pad_ops = { + .enum_mbus_code = lut_enum_mbus_code, + .enum_frame_size = lut_enum_frame_size, + .get_fmt = lut_get_format, + .set_fmt = lut_set_format, +}; + +static struct v4l2_subdev_ops lut_ops = { + .core = &lut_core_ops, + .video = &lut_video_ops, + .pad = &lut_pad_ops, +}; + +/* ----------------------------------------------------------------------------- + * Initialization and Cleanup + */ + +struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1) +{ + struct v4l2_subdev *subdev; + struct vsp1_lut *lut; + int ret; + + lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL); + if (lut == NULL) + return ERR_PTR(-ENOMEM); + + lut->entity.type = VSP1_ENTITY_LUT; + + ret = vsp1_entity_init(vsp1, &lut->entity, 2); + if (ret < 0) + return ERR_PTR(ret); + + /* Initialize the V4L2 subdev. */ + subdev = &lut->entity.subdev; + v4l2_subdev_init(subdev, &lut_ops); + + subdev->entity.ops = &vsp1_media_ops; + subdev->internal_ops = &vsp1_subdev_internal_ops; + snprintf(subdev->name, sizeof(subdev->name), "%s lut", + dev_name(vsp1->dev)); + v4l2_set_subdevdata(subdev, lut); + subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + + vsp1_entity_init_formats(subdev, NULL); + + return lut; +} |